4.3BSD-Reno/src/usr.sbin/named/ns.h
/*
* Copyright (c) 1985, 1990 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted provided
* that: (1) source distributions retain this entire copyright notice and
* comment, and (2) distributions including binaries display the following
* acknowledgement: ``This product includes software developed by the
* University of California, Berkeley and its contributors'' in the
* documentation or other materials provided with the distribution and in
* all advertising materials mentioning features or use of this software.
* Neither the name of the University nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*
* @(#)ns.h 4.31 (Berkeley) 6/1/90
*/
/*
* Global definitions and variables for the name server.
*/
#include <arpa/inet.h>
#include <string.h>
/*
* Timeout time should be around 1 minute or so. Using the
* the current simplistic backoff strategy, the sequence
* retrys after 4, 8, and 16 seconds. With 3 servers, this
* dies out in a little more than a minute.
* (sequence RETRYBASE, 2*RETRYBASE, 4*RETRYBASE... for MAXRETRY)
*/
#define MINROOTS 2 /* min number of root hints */
#define NSMAX 16 /* max number of NS addrs to try */
#define RETRYBASE 4 /* base time between retries */
#define MAXRETRY 3 /* max number of retries per addr */
#define MAXCNAMES 8 /* max # of CNAMES tried per addr */
#define MAXQUERIES 20 /* max # of queries to be made */
/* (prevent "recursive" loops) */
#define INIT_REFRESH 600 /* retry time for initial secondary */
/* contact (10 minutes) */
#define ALPHA 0.7 /* How much to preserver of old response time */
#define BETA 1.2 /* How much to penalize response time on failure */
#define GAMMA 0.98 /* How much to decay unused response times */
struct zoneinfo {
int z_type; /* type of zone */
int z_auth; /* zone is authoritative */
char *z_origin; /* root domain name of zone */
time_t z_time; /* time for next refresh */
time_t z_lastupdate; /* time of last refresh */
u_long z_refresh; /* refresh interval */
u_long z_retry; /* refresh retry interval */
u_long z_expire; /* expiration time for cached info */
u_long z_minimum; /* minimum TTL value */
u_long z_serial; /* changes if zone modified */
char *z_source; /* source location of data */
time_t z_ftime; /* modification time of source file */
int z_addrcnt; /* address count */
struct in_addr z_addr[NSMAX]; /* list of master servers for zone */
int z_state; /* state bits; see below */
u_short z_xferpid; /* xfer child pid */
#ifdef ALLOW_UPDATES
int hasChanged; /* non-zero if zone has been updated
* since last checkpoint
*/
#endif ALLOW_UPDATES
};
/* zone types (z_type) */
#define Z_PRIMARY 1
#define Z_SECONDARY 2
#define Z_CACHE 3
/* zone state bits */
#define Z_AUTH 0x01 /* should replace z_auth */
#define Z_NEED_XFER 0x02 /* waiting to do xfer */
#define Z_XFER_RUNNING 0x04 /* asynch. xfer is running */
#define Z_NEED_RELOAD 0x08 /* waiting to do reload */
#define Z_SYSLOGGED 0x10 /* have logged timeout */
#define Z_CHANGED 0x20 /* should replace hasChanged */
#define Z_FOUND 0x40 /* found in boot file when reloading */
#define Z_INCLUDE 0x80 /* set if include used in file */
#define Z_DB_BAD 0x100 /* errors when loading file */
#define Z_TMP_FILE 0x200 /* backup file for xfer is temporary */
#ifdef ALLOW_UPDATES
#define Z_DYNAMIC 0x400 /* allow dynamic updates */
#define Z_DYNADDONLY 0x800 /* dynamic mode: add new data only */
#endif ALLOW_UPDATES
/* xfer exit codes */
#define XFER_UPTODATE 0 /* zone is up-to-date */
#define XFER_SUCCESS 1 /* performed transfer successfully */
#define XFER_TIMEOUT 2 /* no server reachable/xfer timeout */
#define XFER_FAIL 3 /* other failure, has been logged */
/*
* Structure for recording info on forwarded queries.
*/
struct qinfo {
u_short q_id; /* id of query */
u_short q_nsid; /* id of forwarded query */
int q_dfd; /* UDP file descriptor */
struct sockaddr_in q_from; /* requestor's address */
char *q_msg; /* the message */
int q_msglen; /* len of message */
int q_naddr; /* number of addr's in q_addr */
int q_curaddr; /* last addr sent to */
struct fwdinfo *q_fwd; /* last forwarder used */
time_t q_time; /* time to retry */
struct qinfo *q_next; /* rexmit list (sorted by time) */
struct qinfo *q_link; /* storage list (random order) */
struct qserv {
struct sockaddr_in ns_addr; /* addresses of NS's */
struct databuf *ns; /* databuf for NS record */
struct databuf *nsdata; /* databuf for server address */
struct timeval stime; /* time first query started */
int nretry; /* # of times addr retried */
} q_addr[NSMAX]; /* addresses of NS's */
struct databuf *q_usedns[NSMAX]; /* databuf for NS that we've tried */
int q_nusedns;
int q_cname; /* # of cnames found */
int q_nqueries; /* # of queries required */
char *q_cmsg; /* the cname message */
int q_cmsglen; /* len of cname message */
struct qstream *q_stream; /* TCP stream, null if UDP */
int q_system; /* boolean, system query */
};
#define Q_NEXTADDR(qp,n) \
(((qp)->q_fwd == (struct fwdinfo *)0) ? \
&(qp)->q_addr[n].ns_addr : &(qp)->q_fwd->fwdaddr)
#define PRIMING_CACHE 42
#define QINFO_NULL ((struct qinfo *)0)
#ifndef XFER
extern struct qinfo *qfindid();
extern struct qinfo *qnew();
extern struct qinfo *retryqp; /* next query to retry */
#endif /* XFER */
/*
* Return codes from ns_forw:
*/
#define FW_OK 0
#define FW_DUP 1
#define FW_NOSERVER 2
#define FW_SERVFAIL 3
struct qstream {
int s_rfd; /* stream file descriptor */
int s_size; /* expected amount of data to recive */
int s_bufsize; /* amount of data recived in s_buf */
char *s_buf; /* buffer of recived data */
char *s_bufp; /* pointer into s_buf of recived data */
struct qstream *s_next; /* next stream */
struct sockaddr_in s_from; /* address query came from */
u_long s_time; /* time stamp of last transaction */
int s_refcnt; /* number of outstanding queries */
u_short s_tempsize; /* temporary for size from net */
};
#define QSTREAM_NULL ((struct qstream *)0)
extern struct qstream *streamq; /* stream queue */
struct qdatagram {
int dq_dfd; /* datagram file descriptor */
struct qdatagram *dq_next; /* next datagram */
struct in_addr dq_addr; /* address of interface */
};
#define QDATAGRAM_NULL ((struct qdatagram *)0)
extern struct qdatagram *datagramq; /* datagram queue */
struct netinfo {
struct netinfo *next;
u_long net;
u_long mask;
struct in_addr my_addr;
};
struct fwdinfo {
struct fwdinfo *next;
struct sockaddr_in fwdaddr;
};
struct nets {
char *name;
long net;
struct nets *next;
};
/*
* Statistics Defines
*/
struct stats {
unsigned long cnt;
char *description;
};
/* gross count of UDP packets in and out */
#define S_INPKTS 0
#define S_OUTPKTS 1
/* gross count of queries and inverse queries received */
#define S_QUERIES 2
#define S_IQUERIES 3
#define S_DUPQUERIES 4
#define S_RESPONSES 5
#define S_DUPRESP 6
#define S_RESPOK 7
#define S_RESPFAIL 8
#define S_RESPFORMERR 9
#define S_SYSQUERIES 10
#define S_PRIMECACHE 11
#define S_CHECKNS 12
#define S_BADRESPONSES 13
#define S_MARTIANS 14
#define S_NSTATS 15 /* Careful! */
#ifdef STATS
extern struct stats stats[S_NSTATS];
extern unsigned long typestats[T_ANY+1];
#endif
#ifndef VOID
/* Support posix signals and old systems equally */
#define VOID void
#endif
#ifdef DEBUG
extern int debug; /* debug flag */
extern FILE *ddt; /* debug file discriptor */
#endif
#ifndef XFER
extern int ds; /* datagram socket */
extern struct qdatagram *dqp;
extern struct timeval tt; /* place to store time */
extern struct itimerval ival; /* maintenance interval */
extern struct zoneinfo *zones; /* zone information */
extern int nzones; /* number of zones in use */
extern int forward_only; /* true on slave server */
#endif /* XFER */
#ifdef vax
extern u_short htons(), ntohs();
extern u_long htonl(), ntohl();
#endif
#define MAX_XFER_TIME 60 * 60 * 2 /* max seconds for an xfer */
#define XFER_TIME_FUDGE 10 /* MAX_XFER_TIME fudge */
#ifndef XFER
extern int xfer_running_cnt; /* number of xfers running */
extern int xfer_deferred_cnt; /* number of deferred xfers */
#define MAX_XFERS_RUNNING 4 /* max value of xfer_running_cnt */
#endif /* XFER */